package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetMealMapper setMealMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishMapper dishMapper;

    /**
     * 新增套餐，保存套餐与菜品的关联关系
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        // 向套餐表插入套餐
        setMealMapper.insert(setmeal);
        // 获取生成的套餐id与套餐内的菜品产生关联
        Long setmealId = setmeal.getId();
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setId(setmealId);
        });
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 条件分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setMealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    @Override
    public void deleteByIds(List<Long> ids) {
        // 套餐若在售卖中则无法删除
        ids.forEach(id -> {
            Setmeal setmeal = setMealMapper.getById(id);
            if (setmeal.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        // 删除套餐表中的数据
        setMealMapper.deleteByIds(ids);

        // 删除套餐-菜品关联表中的数据
        setmealDishMapper.deleteByIds(ids);
    }

    /**
     * 根据id查询回显套餐
     * @param id
     * @return
     */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        Setmeal setmeal = setMealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;

    }

    /**
     * 修改套餐信息
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        // 修改套餐信息
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setMealMapper.update(setmeal);

        // 套餐id
        Long setmealId = setmeal.getId();

        // 删除关联的菜品
        setmealDishMapper.deleteByIds(Collections.singletonList(setmealId));
        // 添加关联的菜品
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 起售停售套餐
     * @param status
     * @param id
     */
    @Override
    public void StartOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status == StatusConstant.ENABLE){
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if (dishList!=null && !dishList.isEmpty()){
                dishList.forEach(dish -> {
                    if (dish.getStatus() == StatusConstant.DISABLE){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        Setmeal setmeal = Setmeal.builder()
                .status(status)
                .id(id)
                .build();
        setMealMapper.update(setmeal);
    }
}
